PJB-2009-39
ASSOCIATION OF LASIODIPLODIA THEOBROMAE WITH DIFFERENT DECLINE DISORDERS IN MANGO (MANGIFERA INDICA L.)
MUHAMMAD SHAHBAZ1, ZAFAR IQBAL2, AHMAD SALEEM3 AND MUHAMMAD AKBAR ANJUM4*
Abstract
Mango decline has assumed an alarming position due to increasing losses day by day in the orchards of Pakistan. The problem is intensified due to dearth of reliable information and suitable control strategies. The present studies were planned to characterize the isolates of the fungus Lasiodiplodia theobromae, test their virulence and evaluate different fungicides to find out effective ones for field application. Ten isolates were identified from 10 mango growing districts of the Punjab province of Pakistan. After inoculation on 10 months old seedlings, the fast growing isolates viz., LT-3, LT-6 and LT-7 resulted in 66.66% mortality and 3.0, 4.9 and 4.5 cm2 pathogenicity lesion, respectively. Five fungicides viz., Thiophanate-methyl 70 WP, Carbendazim 50 WP, Precure combi (Thiophanate-methyl + Diethofencarb) 65 WP, Copper oxychloride 50 WP and Captan 50 WP with two doses of concentration, 50 and 100 ppm, were applied In vitro by food poison technique. Colony diameter in amended Petri plates was recorded after 2, 4, 6 and 8 days of inoculation. Thiophanate-methyl, Carbendazim and Precure combi showed 100% decrease over control at 50 and 100 ppm doses while Captan and Copper oxychloride exhibited only 26.84 and 7.8 and 35.26 and 20.2% decrease at both the tested doses, respectively. The results of the present studies will be helpful to devise management strategies for the control of mango decline in the Punjab province of Pakistan.
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